Hi guys.
I don't know nginx yet. A devops guy set one up back a while for our app.

this is the `nginx.conf` he setup.
```
user www-data;
worker_processes auto;
pid /run/nginx.pid;

events {
worker_connections 768;
multi_accept on;
}

http {
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
gzip on;
gzip_disable "msie6";


proxy_cache_path /home/html_catch levels=1:2 keys_zone=appbacktocartcocatch:2m max_size=50m;
proxy_cache_key "$scheme$request_method$host$request_uri$is_args$args";
proxy_cache_valid 200 302 10m;
proxy_cache_valid 404 1m;




include /etc/nginx/sites-enabled/*.conf;




}
```

I can see that it `include`s some other files like this one which is for the app specifically


```
#proxy_cache_path /home/html_catch levels=1:2 keys_zone=appbacktocartcocatch:2m max_size=50m;
#proxy_cache_key "$scheme$request_method$host$request_uri$is_args$args";
#proxy_cache_valid 200 302 10m;
#proxy_cache_valid 404 1m;


upstream appbacktocartco {
# server localhost:3000;
server localhost:3001;
}


server {
listen 145.239.24.196:80;
server_name app.backtocart.co;

location / {

proxy_cache appbacktocartcocatch;

proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_pass http://appbacktocartco;
proxy_read_timeout 90;
}


listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/app.backtocart.co/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/app.backtocart.co/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot


if ($scheme != "https") {
return 301 https://$host$request_uri;
} # managed by Certbot

}
```

Now I just need to run another app like this on port 5000. I just copied this file tried changing a few things, then restarted nginx but got some errors I don't understand. Can you help me with this?